Remove/install brake booster - AR43.10-P-0350NKB

MODEL 117, 156, 176, 242, 246 

Shown on MODEL 246 

Fig 1: Brake Booster Remove/Install Components - Shown On Model 246

Courtesy of MERCEDES-BENZ USA

Shown on MODEL 242 with ENGINE 780 

Fig 2: Brake Booster Remove/Install Components - Shown On Model 242

Courtesy of MERCEDES-BENZ USA

	Risk of poisoning  from swallowing brake fluid. Risk of injury  from skin and eye contact with brake fluid	Only pour brake fluid into suitable and appropriately marked containers. Wear protective clothing and eye protection when handling brake fluid.	AS42.50-Z-0001-01A
	Brake fluid notes		AH42.50-P-0001-01A
	Notes on repairs to brake system		AH42.00-P-0003-01A
	Notes on externally invisible brake fluid loss		AH42.10-P-9406-02V
	Notes on self-locking nuts and bolts		AH00.00-N-0001-01A
	Notes on handling refrigerant R134a		AH83.30-N-0003-01A
	Remove/install
1	Drain air conditioning system	MODEL 242 with ENGINE 780 without CODE 2U8 (Refrigerant R-1234yf)
			AR83.30-P-1760NKB
		Evacuate air conditioning and then fill it.
2	Eliminate vacuum in BAS brake booster (A7/7)	To do this, press the brake pedal several times with the engine switched off.
3	Remove engine cover	MODEL 117, 156, 176 with ENGINE 133 MODEL 117, 156, 176, 246 with ENGINE 651
		ENGINE 651 in MODEL 117, 156, 176, 246	AR01.20-P-5014-02OLB
4	Remove air filter housing	MODEL 117, 156, 176 with ENGINE 133	AR09.10-P-1150MTA
		MODEL 176, 246 with ENGINE 607	AR09.10-P-1150ORA
		ENGINE 270 in MODEL 117, 156, 176, 242, 246	AR09.10-P-1150MT
		ENGINE 651 in MODEL 117, 156, 176, 246	AR09.10-P-1150OLB
5	Remove rear bottom part of soundproofing	MODEL 117, 156, 176, 246 with ENGINE 607, 651
		MODEL 156 with ENGINE 607, 651	AR61.20-P-1105NKB
		ENGINE 607, 651 in MODEL 117 ENGINE 607, 651 in MODEL 176 ENGINE 607, 651 in MODEL 246	AR94.30-P-5300NKB
6	Remove engine air intake duct upstream of turbocharger and downstream of air filter housing	MODEL 117, 156, 176, 246 with ENGINE 651
			AR09.10-P-8130OLB
		The engine air intake duct upstream of turbocharger remains in the engine compartment.
7	Remove battery		AR54.10-P-0005NKB
8	Remove side paneling (3)	MODEL 117, 156, 176, 246 MODEL 242 with ENGINE 270 To do so, press in notches (4) and take out side paneling (3) of battery base (5) in direction of travel.
9	Disconnect electrical connector on brake fluid level switch (S11) and unclip electrical line (7) from master brake cylinder	Replacing retaining clip Observe routing of electrical line (7).
10	Unclip ground line (1) from battery base (5) and remove	Replace retaining clip if necessary.
11	Remove battery base (5)	Screw/bolt, battery frame to battery bracket	*BA54.10-P-1002-01I
12	Unclip positive line (2) from bracket (6)	Replace retaining clip if necessary.
13	Detach purging switchover valve from bracket (6)	MODEL 117, 156, 176, 242, 246 with ENGINE 133, 270
14	Detach bracket (15) from body	MODEL 242 with ENGINE 780
15	Unscrew nut (17) and place refrigerant line (16) to one side	MODEL 242 with ENGINE 780 Close off connections immediately using suitable stop plugs.
		Record plug	Fig 3
16	Detach bracket (6) from body	Screw/bolt, battery bracket to body	*BA54.10-P-1001-01I
17.1	Pull check valve (8) out of BAS brake booster (A7/7)	MODEL 117, 156, 176, 246 MODEL 242 with ENGINE 270 Replace rubber seal on BAS brake booster (A7/7).
17.2	Remove vacuum line (18)	MODEL 242 with ENGINE 780
			AR43.10-P-0355NKB
18	Unlock retaining clip (19) and place refrigerant line (16) to one side	MODEL 242 with ENGINE 780
19	Unscrew nuts (20) and place refrigerant line (16) to one side	MODEL 242 with ENGINE 780 Close off connections immediately using suitable stop plugs.
		Record plug	Fig 3
20	Remove nut (21) and place electrical line (22) to one side
21	Release and disconnect electrical connection on brake vacuum sensor (B64/1)	MODEL 242 with ENGINE 780 Two brake vacuum sensors (B64/1) present.
22	Unscrew cap and remove sieve from brake fluid reservoir (9)
23	Suction off brake fluid from the brake fluid expansion reservoir (9)
24	Detach feed hose for clutch master cylinder from brake fluid reservoir (9)	MODEL 117, 156, 176, 242, 246 with TRANSMISSION 711 Protect painted surfaces from brake fluid. Otherwise damage can occur to the vehicle paint. Seal the connections immediately using stop plugs. Install new seal between feed hose and brake fluid reservoir (9) if necessary.
		Record plug	Fig 3
25	Mark brake lines (10) relative to the corresponding connections
26	Detach brake lines (10) from master brake cylinder	Collect brake fluid which runs out with an absorbent rag. Otherwise damage can occur to the vehicle paint. Seal connections on master brake cylinder. This prevents foreign objects from entering. Seal the connections immediately using stop plugs.
		Retaining screw, brake line to master brake cylinder	*BA42.10-P-1003-04L
		Record plug	Fig 3
27	Remove driver kneebag	MODEL 117, 156, 176, 242, 246 with CODE 294 (Kneebag)
			AR91.60-P-0200NKB
28	Remove accelerator pedal and place to one side with electrical line connected		AR30.12-P-1321NKB
29	Remove air duct (14) in driver footwell
30	Remove safety screw (11)	Replace safety screw (11).
		Brake booster to brake pedal	*BA43.10-P-1002-01J
31	Unscrew nuts (12) of BAS brake booster (A7/7) from brake pedal	Nut, brake booster carrier to front end	*BA43.10-P-1001-01J
32	Take out BAS brake booster (A7/7)	Press brake lines (10) to the side carefully and do not deform. Otherwise these must be replaced. Do not damage the boot (13) when removing and installing BAS brake booster (A7/7). Otherwise the BAS brake booster (A7/7) must be replaced. When removing the BAS brake booster (A7/7) turn the engine air intake duct upstream of the turbocharger and place out of the working area.
33	Remove brake master cylinder	When replacing the BAS brake booster (A7/7).
			AR42.10-P-0300NKB
34	Install in the reverse order
35	Bleed brake system		AR42.10-P-0010NKB
36	Carry out brake test on the test stand
			AP42.00-P-4290BA

Fig 3: Identifying Record Plug (129 589 00 91 00)

Courtesy of MERCEDES-BENZ USA